Spinal Discs

Friday, 8 April 2016

The Effect of Delayed Onset Muscle Soreness on Muscle Strength

A significant
reduction in muscle strength and power has been observed during DOMS, especially
during eccentric activity. These reductions usually present 24-48 hours
following DOMS-induced exercises. Strength reductions in concentric and
isometric muscle actions are not as significant as eccentric exercises. Concentric
and isometric muscle strengths usually take about 4 days to recover, whilst
eccentric muscle strength may take up to 8-10 days to recover to initial
baseline levels. These muscle strength reductions will cause muscle imbalance
between agonist and antagonist muscle groups. There will be an increased risk
of injury in an athlete as a result of altered strength in these two muscle
groups.

Muscle or
connective tissue injuries during eccentric exercises may result in altered
recruitment patterns or altered temporal sequencing of muscle activation
patterns. This unusual muscle recruitment patterns during a set of movements
are known as muscle dysfunction. Muscle co-ordination and joint motion are
affected due to muscle dysfunction. High force eccentric activity may cause
damage to fast twitch muscle fibres. There is an electromechanical delay that
contributes to the altered temporal sequencing of muscles. This
electromechanical delay refers to the time lag between the onset of muscle and
nerve activation and muscle contraction.

EMG
assessment has been used to identify muscle dysfunction in agonist and
antagonist muscle groups. Agonist and antagonist muscle groups are muscles that
carry out similar or opposing functions during joint movements. EMG assessment
has been shown to be useful in patella-femoral pain and neck and back pain. The
compensatory increase in EMG activity in an uninjured area or in other muscle
groups is noted.

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